A sprained ankle is an injury caused by rolling or twisting the ankle beyond its normal range of motion. It can occur during sports or other activities that involve sudden ankle inversion or twisting. There are three grades of ankle sprains ranging from mild ligament stretching to a complete ligament tear. Treatment involves RICE (rest, ice, compression, and elevation) along with rehabilitation exercises to restore flexibility, strength and prevent future injuries. Surgery may be needed for severe Grade 3 sprains involving ligament reconstruction.